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Cathode Ray Tube (CRT): Construction, Components and Working of Cathode Ray Tube

Cathode Ray Tube:

Cathode Ray Tube: Cathode Ray Tube is the most important in Cathode Ray Oscilloscope (CRO), due to major functions is done by Cathode Ray Tube. Cathode Ray Tube (CRT) is also a Heart of oscilloscope. The function of this tube is to generates, accelerates and deflects the electrons to produce the visible spot and there are different types of components in Cathode Ray Tube (CRT). The Main Parts in Cathode Ray Tube (CRT) is Electronic Gun, Deflection Plates and  Fluorescent Screen

Construction of Cathode Ray Tube (CRT):

*) Electronic Gun
*) Deflection plates
*) Fluorescent Screen


Electronic Gun:

  • By this electronic gun, the beam is formed by the electrons emits from it. 
  • In this there are different types of parts like heater, cathode, pre-accelerating anode, accelerating anode etc..
  • In this, the intensity of the electron beam depends on the number of electrons emitted from the cathode.
  • When the cathode is heated the electrons are emitted from it, these electrons pass through the small hole in the control grid. By high positive potential the electrons used to accelerated, this is done by applying the pre-accelerating and accelerating anodes. by the help of focussing node, the electron beam is focussed.
  • In this anodes is the cylindrical form with a small opening at the center of each electrode. the electron beams used to pass through vertical and horizontal plates and then goes on to the screen this done after living the focusing anode.

Deflection plates

  • There are Vertical and horizontal deflection plates.
   Vertical Plates:
  • This is placed horizontally and used to produce an electric field in a vertical direction.
   Horizontal plates:
  • This is placed in vertically and used to produced electric field in the horizontal direction.

Fluorescent Screen


  • When the Fluorescent material is coated on the screen of CRT a Fluorescent screen is formed. in this for visualizing the striking electron beam on the CRT, the Fluorescent coating is necessary.
  • In this, the Fluorescent screen emits light and spot visible is available this is done when electrons are bombarded on the cathode ray tube.

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